Stackable chair



FIG. 1 is a side elevation of a chair embodying my design;

FIG. 2 is a front elevation thereof;

FIG. 3 is a rear elevation thereof;

FIG. 4 is a top plan view thereof; and

FIG. 5 is a bottom plan view thereof.

The appearance of the side of the stackable chair not shown in the drawing is identical with the appearance of the side shown in FIG. 1. 

The ornamental design for a stackable chair, substantially as shown and described. 